Substation telephone set



Nov, 15, 1927.

J. ERECKSON SUBSTATION TELEPHONE SET Filed Dec. 7. 1920 3 SheetsSheet lNov. 15, 192 7. 1,649,156

J. ERICKSON SUBSTATION TELEPHONE SET Filed Dec. 1920 5 Sheets-Sheet 2J1: End 52E 5,211.14

Nov. 15, 1927. 1,649,156

J. ERlCKSON SUBSTATION TELEPHONE S ET Filed Dec. 7. 1920 3 Sheets-Sheets Ju'h Ermksm UNITED STATES JOHN ERIGKSON, OF CHICAGO, ILLINOIS,

PATENT OFFICE.

nssronon, BY mns'nnnssremmnrs, T

AUTOMATIC ELECTRIC INC., OF CHICAGO, ILLINOIS, A CORPORATION OFDELAWARE.

SUBSTATI01 I TELEPHONE SET.

Application filed December 7, 1920. Serial No. 428,963.

The present invention relates in general to substation telephone sets,and as to one of its features, is concerned particularly with substationsets for use in. automatic telephone systems.

0 moved from the hook\to initiate a call. This may'be due to theswitch-hook arms being bent too close togetherlor it may be due tocarelessness on the part of the person attempting to' make thecall. Inany event if the switch-hook is moived sufliciently to break the linecircuit after the said circuit has been closed by the removal of thereceiver, a false impulse is transmitted over the line and the callingsubscriber fails to m obtain connection with the station number llti forwhich the calling device is subsequently operated.

Generally stated, therefore, the invention is to provide positive andem- .cient means for closing the line circuit in such a manner as toprevent the transmission of a false impulse to the central oficeswitching mechanism.

In accordance with another feature of the invention, improvements in thedesign of the various parts have been made, whereby the essential partsof a telephone instrument may be more readily assembled or taken apart,all of the said parts, when assembled, being locked and secured rigidlyin position by a single screw. This feature, it may be stated, is notlimited to automatic telephone instruments, but is applicable also toinstruments intended for use in manual systems.

The foregoing and other features will be described fully hereinafter,reference being 'had to the accompanying drawings, in

which Fig. 1 is a side view of an automatic desk telephone set, withreceiver removed, which embodies the several features of the invention.7

Fig. 2 is a front view, partly in section, of the same instrument, andglves a general idea of the internal construction.

Fig. 3 is a view from below with the base and calling device removed,and shows the arrangement of the connecting terminals.

Fig. t is a detail which shows how the one object of mounting plate issecured to the transmitter head or support.

Fig. 5 is a view which shows the switchhook and its locking mechanismpartly assembled, and illustrates clearly the operation of the latter.

Fig. 6 shows the locking lever separately, so that its shape may beclearly appreciated.

Fig. 7 shows the switch-hook, dismounted, as viewed from below.

Fig. 8 is a fragmentary view of the lower end of the tubular standard.

Referring now particularly to Figs. 1, 2, and 3, the base 4 ispreferably a metal stam mg of the form shown. The tubular standard 3 1sprovided at its upper end with a transverse slot 19 that permits theswitchhook 1 to move up and down, while near its lower end it is forcedout to form the shoulder 20. There is a shoulder on the transmittersupport 6, which prevents it from going too far into the tube 3 as willbe later explained. The mounting plate 7 is secured to the transmittersupport 6 by two screws such as the one shown in Fig. 4:. The plate 7(Fig. 2) has two slots 31 and 32 through which connecting conductors maybe passed. Insulated alike from each other and from the plate 7 andmounted thereon are four springs 25-28, inclusive, whose well knownfunction is to open the bell circuit and close the line circuit wheneverthe receiver is removed from the hook. A-lever 12 plvoted to plate 7 bypivot screw has a sprmg 17 which acts against stud 41 to push said leveragainst switch-hook 1. A bushing 29 secured to the lower end of lever 12insulates the spring 26 from the said lever- Switch-hook 1, clearly seenin Fig. 7

pivoted by rod 15 inside removable bear- 1ngs16 as shown in Figs. 2, 3,and 5? Iiock ing lever 2, shown most clearly in Figs. 2 and 6, 1splvoted by screw 13 to plate 7, and

is forced outward by spring 18 to engage and lock switch-hook 1 asshownin Fig. 5 whenever the latter moves up in response to the removalof the receiver.

At the lower end of tube 3 there are two diametrically oppositepositioning slots 33 and 31 (shown in detail in Fig. 8) adapted toreceive inwardly extending projections of base 4 and support 14..Support 14 supports the terminal or binding post mountings 10 and 11which are fastened to the support 14:

llld

by screws 21-24, inclusive, as shown in Fig. 3. The bottom 35 (Fig. 1)is fastened onto support 14 by a screw which passes first through thebottom and then through threaded hole 36 which is shown in Fig. 3.

To assemble the set, the tube 3 is slipped over the transmitter support6, so that slot 19 comes in the place indicated in Figs. 1 and 2, and ispushed on until it is stopped by shoulder 30. The base 4 is turned untilthe dial 5 comes directly under the transmitter, when the positioningslots 33 and 34 allow it to be slipped on the lower end. of tube 3.Support 14 is then slipped on in the position shown in Fig. 3. afterwhich the clamping piece 8 (Figs. 2 and 3) is placed in position and thescrew 9 is put through an unthreaded hole in the clamping piece 8 and isthen screwed into a threaded hole in plate 7. When drawn up tightly, thescrew 9'holds the entire assembly together. The bottom 35 is then placedon and fastened by means of a screw passing through the same and intothreaded hole' 36 (Fig. 3).

Referring now particularly to Figs. 2 and 5, when the calling subscriberraises the receiver (not shown) from the switch-hook 1, the spring 17pressing against stud 41 causes the top part of lever 12 to move to theleft and raise said switch-hook 1. while the bottom part moves to theright and operates the springs 25-28, inclusive, for the wellknownurpose of opening the bell circuit and closmg the line circuit. When theswitch-hook 1 is raised, spring 18 carried bylever 12 pushes the lockinglever 2 to the left until it locks switchhook 1 as is clearly shown inFig. 5. Since switchhook 1 is now locked by lever 2 it cannot heaccidentally or intentionally moved sufficiently to cause the opening ofthe line circuit until the locking lever 2 is pushed back out of theway.

When the receiver is replaced, the locking lever 2 is forced back andunlocks the switchhook 1 which moves down under the weight of thereplaced receiver.

Having described my invention, what I consider to be new and desire tohave protected by Letters Patent will be pointed out in the appendedclaims.

What I claim as my invention is:

1. In a substation telephone set, a switch hook, contact springscontrolled by said switch hook for closing the line circuit when thereceiver is removed. and means operated in response to the removal ofsaid receiver for locking said switch hook to prevent manual operationthereof while the receiver is removed without first unlocking the same.

2. In a substation telephone set. a two position switch hook normallyheld inone of its positions by the receiver. means for moving saidswitch hook to its alternate position when the receiver isremoved. and alocking device automatically bperated in response to the removal of saidreceiver for locking the said switch hook in its alternate position.

3. In a substation telephone set, a two position switch hook normallyheld in one of its positions by the'receiver, means for moving saidswitch hook to its alternate position when the receiver is removed, anda pivoted member automatically operative responsive to such removal forlocking said switch hook in its alternate position.

4. In a substation telephone set,atwo position switch hook normally heldin one of its positions by the receiver, means for moving said switchhook to its alternate position when the receiver is removed, a pivotedmember for locking said switch hook in its alternate position, and aprojection on said member adapted to be engaged by the receiver whenreplaced, whereby the said switch hook is unlocked.

5. In a substation telephone set, a two position switch hook normallyheld in one of its positions by the receiver, means for moving saidswitch hook to its alternate position when the receiver. is removed, anda spring actuated member operated in response to the removal of thereceiver for locking said switch hook in its alternate position.

6. In a substation set, a two osition switch hook normally held in one 0its positions by the receiver, means for moving said switch hook to itsalternate position when thereceiver is removed, a locking deviceoperated in response to the removal of said receiver for locking saidswitch hook in its alternate position, and means for automaticallyreleasing said locking device in response to the replacement of saidreceiver for unlocking said switch hook and allowing the same to returnto its normal position.

7. In a substation telephone set, a two position switch hook normallyheld in one of its positions by the receiver, means for moving saidswitch hook to its alternate positiori when the receiver is removed, anda locking device automatically operated upon the removal of saidreceiver to lock said hook against movement until said receiver isreplaced.

8. In a substation telephone set, a twoposition switchhook normally heldin its lowermost position by the receiver, means for moving saidswitchhook to its uppermost position when the receiver is removed, a,locking member rendered active upon removal of the receiver to lock theswitchhook in its uppermost position the instant that it reaches thatposition, said locking member also rendered ineffective immediately uponthe replacement of the receiver on said switchhook.

9. In a substation telephone set, a twoposition switchhook normallyheldin its lowermost position by the receiver, means 10. lln a substationtelephone set, a two-.

position switchhook normally held in one position by the receiver, meansfor automaticall moving and subsequently locking said swltchhook in itsalternate position when the receiver is removed, said locking meanscomprising a movable, spring actuated, S shaped member having a notchengaging an aperture on said switchhook, and automatic means responsiveto the placing of said receiver on said switehhook for moving saidmember to disengage said notch from said-aperture to unlock saidswitchhookand restore it to normal.

11. In a substation telephone set, a switch hook normally held inposition by the receiver, means for moving said switch hook to itsoperated position when thereoeiver is removed, and a spring actuatedmember having an extension pivoted in said telephone set operatedresponsive to the removal of the receiver for locking said switch hookin said operated position.

12. In a substation telephone set, a two position switch, hook normallyheld in one position by the receiver, means responsive to the removal ofthe receiver for moving said switch hook to its alterhateposition and anS shaped locking member having a long extension pivoted in saidtelephone set and actuated by a spring for locking said switch hook insaid alternate position.

Signed by me at Chica o, Gook County, Illinois, this 29th day ofovember, 1920.

.10m? EBICKSON.

